4 These are some possible outcomes for an aeroplane that is due to arrive at midday tomorrow.
A: It is late.
B: It arrives at 12 35.
C: It arrives before 11 45.
D: It arrives after 11 50.
E: It is early.
a Are any pairs of these outcomes mutually exclusive?
If so, which pairs?
b Write down three mutually exclusive outcomes for
when the aeroplane lands, one of which must happen.
Answer:
it arrives after 12. 35
it is early
it was late